order Hymenoptera vs class Hexapoda

order Hymenoptera and class Hexapoda both are nouns.

Word	Noun	Adjective	Verb	Adverb
order Hymenoptera	Yes	No	No	No
class Hexapoda	Yes	No	No	No

order Hymenoptera (noun)	class Hexapoda (noun)
an order of insects including: bees, wasps, ants, ichneumons, sawflies, gall wasps, etc.	insects; about five-sixths of all known animal species